Compex SCSI TO S-ATA RAID Spezifikationen PDF herunterladen (Seite 163)

Array Expansion

8-1

Array Expansion

The array expansion functions allow you to expand storage capacity

without the cost of buying new equipment. Expansion can be

completed on-line while the system is serving host I/Os.

8.1 Overview

What is RAID Expansion and how does it work?

Before the invention of RAID Expansion, increasing the capacity of

a RAID system meant backing up all data in the disk array, re-

creating the disk array configuration with new drives, and then

restoring data back into system.

Infortrend’s RAID Expansion technology allows users to expand a

logical drive by adding new drives, or replacing drive members

with drives of larger capacity. Replacing is done by copying data

from the original members onto larger drives; the smaller drives can

then be replaced without powering down the system.

8.2 Notes on Expansion

1. Added Capacity:

When a new drive is added to an existing logical drive, the

capacity brought by the new drive appears as a new partition.

For example, if you have 4 physical drives (36GB each) in a

logical drive, and each drive’s maximum capacity is used, the

capacity of the logical drive will be 108GB. (One drive’s capacity

is used for parity, e.g., RAID 3). When a new 36GB drive is

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Compex SCSI TO S-ATA RAID Spezifikationen Seite 163